New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering over a Range of Spin-0 Nuclei

PREX and CREX Collaborations

doi:10.1103/PhysRevLett.128.142501

New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering over a Range of Spin-0 Nuclei

PREX and CREX Collaborations

Idaho State University
Texas A&M University-Kingsville
University of Zagreb
California State University Los Angeles
College of William and Mary
Thomas Jefferson National Accelerator Facility
National Institute for Nuclear Physics
Louisiana Tech University
Mississippi State University
University of Manitoba
University of Virginia
Stony Brook University
Carnegie Mellon University
University of Connecticut
Center for Frontiers in Nuclear Science
Brookhaven National Laboratory
Hampton University
University of Massachusetts
Old Dominion University
Temple University
Indiana University Bloomington
Ohio University
Syracuse University
Duquesne University
University of Winnipeg
Jožef Stefan Institute
University of Ljubljana
University of Colorado Boulder
Virginia Polytechnic Institute and State University
Argonne National Laboratory
A. Alikhanian Yerevan Institute of Physics
Johannes Gutenberg University Mainz
Shandong University

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

We report precision determinations of the beam-normal single spin asymmetries (An) in the elastic scattering of 0.95 and 2.18 GeV electrons off C12, Ca40, Ca48, and Pb208 at very forward angles where the most detailed theoretical calculations have been performed. The first measurements of An for Ca40 and Ca48 are found to be similar to that of C12, consistent with expectations and thus demonstrating the validity of theoretical calculations for nuclei with Z≤20. We also report An for Pb208 at two new momentum transfers (Q2) extending the previous measurement. Our new data confirm the surprising result previously reported, with all three data points showing significant disagreement with the results from the Z≤20 nuclei. These data confirm our basic understanding of the underlying dynamics that govern An for nuclei containing 50 nucleons, but point to the need for further investigation to understand the unusual An behavior discovered for scattering off Pb208.

Original language	English
Article number	142501
Journal	Physical Review Letters
Volume	128
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.128.142501
State	Published - 8 Apr 2022
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2022 American Physical Society.

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10.1103/PhysRevLett.128.142501

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@article{491c9d07c40e4eeda55b3449fd9e4a1c,

title = "New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering over a Range of Spin-0 Nuclei",

abstract = "We report precision determinations of the beam-normal single spin asymmetries (An) in the elastic scattering of 0.95 and 2.18 GeV electrons off C12, Ca40, Ca48, and Pb208 at very forward angles where the most detailed theoretical calculations have been performed. The first measurements of An for Ca40 and Ca48 are found to be similar to that of C12, consistent with expectations and thus demonstrating the validity of theoretical calculations for nuclei with Z≤20. We also report An for Pb208 at two new momentum transfers (Q2) extending the previous measurement. Our new data confirm the surprising result previously reported, with all three data points showing significant disagreement with the results from the Z≤20 nuclei. These data confirm our basic understanding of the underlying dynamics that govern An for nuclei containing 50 nucleons, but point to the need for further investigation to understand the unusual An behavior discovered for scattering off Pb208.",

author = "\{PREX and CREX Collaborations\} and D. Adhikari and H. Albataineh and D. Androic and K. Aniol and Armstrong, \{D. S.\} and T. Averett and \{Ayerbe Gayoso\}, C. and S. Barcus and V. Bellini and Beminiwattha, \{R. S.\} and Benesch, \{J. F.\} and H. Bhatt and \{Bhatta Pathak\}, D. and D. Bhetuwal and B. Blaikie and J. Boyd and Q. Campagna and A. Camsonne and Cates, \{G. D.\} and Y. Chen and C. Clarke and Cornejo, \{J. C.\} and \{Covrig Dusa\}, S. and Dalton, \{M. M.\} and P. Datta and A. Deshpande and D. Dutta and C. Feldman and E. Fuchey and C. Gal and D. Gaskell and T. Gautam and M. Gericke and C. Ghosh and I. Halilovic and Hansen, \{J. O.\} and F. Hauenstein and W. Henry and Horowitz, \{C. J.\} and C. Jantzi and S. Jian and S. Johnston and Jones, \{D. C.\} and B. Karki and S. Kakkar and S. Katugampola and Keppel, \{C. E.\} and King, \{P. M.\} and King, \{D. E.\} and M. Knauss",

note = "Publisher Copyright: {\textcopyright} 2022 American Physical Society.",

year = "2022",

month = apr,

day = "8",

doi = "10.1103/PhysRevLett.128.142501",

language = "אנגלית",

volume = "128",

journal = "Physical Review Letters",

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T1 - New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering over a Range of Spin-0 Nuclei

AU - PREX and CREX Collaborations

AU - Adhikari, D.

AU - Albataineh, H.

AU - Androic, D.

AU - Aniol, K.

AU - Armstrong, D. S.

AU - Averett, T.

AU - Ayerbe Gayoso, C.

AU - Barcus, S.

AU - Bellini, V.

AU - Beminiwattha, R. S.

AU - Benesch, J. F.

AU - Bhatt, H.

AU - Bhatta Pathak, D.

AU - Bhetuwal, D.

AU - Blaikie, B.

AU - Boyd, J.

AU - Campagna, Q.

AU - Camsonne, A.

AU - Cates, G. D.

AU - Chen, Y.

AU - Clarke, C.

AU - Cornejo, J. C.

AU - Covrig Dusa, S.

AU - Dalton, M. M.

AU - Datta, P.

AU - Deshpande, A.

AU - Dutta, D.

AU - Feldman, C.

AU - Fuchey, E.

AU - Gal, C.

AU - Gaskell, D.

AU - Gautam, T.

AU - Gericke, M.

AU - Ghosh, C.

AU - Halilovic, I.

AU - Hansen, J. O.

AU - Hauenstein, F.

AU - Henry, W.

AU - Horowitz, C. J.

AU - Jantzi, C.

AU - Jian, S.

AU - Johnston, S.

AU - Jones, D. C.

AU - Karki, B.

AU - Kakkar, S.

AU - Katugampola, S.

AU - Keppel, C. E.

AU - King, P. M.

AU - King, D. E.

AU - Knauss, M.

PY - 2022/4/8

Y1 - 2022/4/8

N2 - We report precision determinations of the beam-normal single spin asymmetries (An) in the elastic scattering of 0.95 and 2.18 GeV electrons off C12, Ca40, Ca48, and Pb208 at very forward angles where the most detailed theoretical calculations have been performed. The first measurements of An for Ca40 and Ca48 are found to be similar to that of C12, consistent with expectations and thus demonstrating the validity of theoretical calculations for nuclei with Z≤20. We also report An for Pb208 at two new momentum transfers (Q2) extending the previous measurement. Our new data confirm the surprising result previously reported, with all three data points showing significant disagreement with the results from the Z≤20 nuclei. These data confirm our basic understanding of the underlying dynamics that govern An for nuclei containing 50 nucleons, but point to the need for further investigation to understand the unusual An behavior discovered for scattering off Pb208.

AB - We report precision determinations of the beam-normal single spin asymmetries (An) in the elastic scattering of 0.95 and 2.18 GeV electrons off C12, Ca40, Ca48, and Pb208 at very forward angles where the most detailed theoretical calculations have been performed. The first measurements of An for Ca40 and Ca48 are found to be similar to that of C12, consistent with expectations and thus demonstrating the validity of theoretical calculations for nuclei with Z≤20. We also report An for Pb208 at two new momentum transfers (Q2) extending the previous measurement. Our new data confirm the surprising result previously reported, with all three data points showing significant disagreement with the results from the Z≤20 nuclei. These data confirm our basic understanding of the underlying dynamics that govern An for nuclei containing 50 nucleons, but point to the need for further investigation to understand the unusual An behavior discovered for scattering off Pb208.

UR - https://www.scopus.com/pages/publications/85128770077

U2 - 10.1103/PhysRevLett.128.142501

DO - 10.1103/PhysRevLett.128.142501

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C2 - 35476486

AN - SCOPUS:85128770077

SN - 0031-9007

VL - 128

JO - Physical Review Letters

JF - Physical Review Letters

IS - 14

M1 - 142501

ER -

New Measurements of the Beam-Normal Single Spin Asymmetry in Elastic Electron Scattering over a Range of Spin-0 Nuclei

Abstract

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